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JavaScript (Node.js), 40 bytes f=(a,b,c=1)=>a.reduce((d,e)=>d+e*(c*=b)) Try it online!
Answer
#1: Initial revision
by
Hakerh400
·
2020-11-13T23:59:11Z (about 4 years ago)
# [JavaScript (Node.js)], 40 bytes
<!-- language-all: lang-javascript -->
f=(a,b,c=1)=>a.reduce((d,e)=>d+e*(c*=b))
[Try it online!][TIO-khgx7ivi]
[JavaScript (Node.js)]: https://nodejs.org
[TIO-khgx7ivi]: https://tio.run/##TYwxb8MgEIV3/wpvuYspNFW3iFTq1ilLtjTDGbBC1ALiIB2q/HYXe6r0dNL7Tt@70Z3YZJ/KU4jWzfOkgcQojN6hPpDMzlbjAKxwrdvBbcFs9Yg4K9Wfrp77llvl0n@oY7cnfb6IlKNxzJKL9UHGABtLhTZiXAZT5Ss0f@Uu2BUD6cNv98@Ltcif7IuDqf1IcvryBZR4@2SF8pvSYgyEog3GBIjD@YLdA@G9TpPL0sRgqACtHOedfBb9y3Je/wA "JavaScript (Node.js) – Try It Online"